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    <script>
        // + 拼接
        // let age = 5
        // console.log('丁晓豆今年' + age + '岁')

        // ${} 反引号 模版字符串
        // let age = 5
        // console.log(`丁晓豆今年${age}岁`)

        price >= 10 && price <= 500  // && 左边和右边两个条件都要满足  true 一假则假
        uname == '周' || uname == '王'  // || 一真则真

    </script>
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